The Globe and Mail reports in its Thursday edition that President Donald Trump's trade war has taken on a global dimension, with key U.S. allies and trading partners imposing new levies on American goods in response to tariffs issued by the White House on foreign aluminum and steel. A triple-bylined item led by Nathan VanderKlippe says that a swift response from Canada and the European Union came three weeks before the day Mr. Trump has pledged a far more sweeping set of tariffs -- an imminent date that has also constrained the response from other countries, including Australia and Britain, as they wait to see what might come next. Hours after the new U.S. tariffs on metal imports went into place, Canada imposed counterlevies, which will take effect Thursday at midnight, on $29.8-billion worth of U.S. goods, including steel, aluminum, computers and sports equipment. The EU's retaliatory measures, calibrated to injure Republican-leaning areas of the U.S., are set to go into effect next month. Mr. Trump has shown no sign of wavering from his intent to enact greater barriers to trade with the U.S., saying Wednesday that global "reciprocal" tariffs promised for April 2 could extend beyond mere tit-for-tat measures.